'Astray' in the Bible

What do you think? If a man has 100 sheep, and one of them goes astray, won’t he leave the 99 on the hillside and go and search for the stray?

And if he finds it, I assure you: He rejoices over that sheep more than over the 99 that did not go astray.

False messiahs and false prophets will arise and perform great signs and wonders to lead astray, if possible, even the elect.